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There are 2 Nudibranch in the picture, but this Spotting will for the Nudibranch on the left - Hypselodoris tyroni. This species, Hypselodoris tyroni is known to have an interesting behaviour, whereby they have the tendency to bump/cozying up to another Nudibranch (of their species) and also following each other with the head touching the tail/end of the Nudibranch in front.
The Nudibranch on the right is Chromodoris annae